Not downloading to local drive, and youtube videos are pixelated

Hi everyone,

I am a new user of this software.  I am trying to export to Youtube, and also to my Desktop. The video to YouTube is coming out all pixelated.  And the download to my desktop is registering 0 bytes (ie - nothing downloaded).  

I actually was able to get the video to download to my desktop once - but realized that the video was in a square aspect ratio.  I changed to 16:9.  Could that possibly be the issue somehow?  

Any thoughts as to what I am doing wrong?